Fig. 3

Spatio-temporal migration of seismicity from November 1, 2018, to July 1, 2024. (a) Map of the seismicity under Montagne Pelée showing earthquakes localized shallower than 41 km. Tectonic faults are represented²⁰. The full focal mechanism of the April 25, 2019, Mw = 3.8 earthquake (Fig. S5) is composed of a 41.1% double-couple component, a 31.3% compensated linear vector dipole (CLVD) component, and a 27.5% volumetric component. It is compatible with a rupture on a quasi N-S striking strike-slip fault plane in transtension north of Montagne Pelée with a large non-double-couple component. The map was developed with GMT software 4.5.7 and a digital elevation model of Montagne Pelée from the shuttle radar topography mission (30-m resolution) and bathymetry from Ryan et al.²². CAR: Caribbean plate. (b) N-S profile of the seismicity during this period. Note that the scale of the circles, which is relative to the event magnitude, is not the same as in (a). The color scale provides an indication of the event occurrence time.